Dam Failures
Teton Dam
The new dam whose first visible leaks became an unstoppable internal collapse.
The knowledge that remained
Knowledge that outlived the failure.
- 01
Visible leakage can be the final symptom of failure already progressing inside a structure.
- 02
Emergency intervention has limits once erosion becomes self-accelerating.
- 03
First filling is a critical test phase, not routine operation.
The disaster forced the United States to rethink dam safety and became a lasting warning about how quickly small leaks can become uncontrollable.
Timeline
The sequence of failure.
- 01WarningJUN 05, 1976
Leaks appear
Water begins escaping through the dam during its first filling.
- 02DecisionEMERGENCY
Crews intervene
Bulldozers attempt to plug the growing holes.
- 03DecisionESCALATION
The flow wins
Internal erosion accelerates beyond the crews’ ability to stop it.
- 04InvestigationAFTERMATH
The dam collapses
A catastrophic flood devastates downstream communities and changes dam safety.
The event.
On June 5, 1976, water began leaking through the earth-filled Teton Dam in Idaho. Bulldozer crews moved toward the structure and tried to slow the growing failure.
Eleven people died and downstream communities were devastated by the sudden release of water.
The mechanism.
Internal erosion turned growing leaks into an uncontrollable structural breach.
The holes expanded, the flow overwhelmed the intervention, and the dam collapsed. Nearly a million cubic feet of water per second rushed downstream.
Sources & references
Trace the evidence.
Media rights record: Episode imagery comes from the U.S. Bureau of Reclamation and is recorded as public-domain government media.
Discovery edition
The case in under one minute.
The Short introduces the failure. This archive record preserves the mechanism, evidence, and engineering lesson beyond the video.
Short ready for releaseEditorial derivatives
Editions from this case.
A portable, source-backed edition of the complete case.
The failure sequence formatted for print and classroom display.
Mechanism, consequence, and lesson in one visual system.
Discussion prompts, activities, and a structured answer guide.
The question to remember
Can a small leak really destroy an entire dam?
Yes. In an earth-filled structure, internal erosion can become self-accelerating long before the full scale of the damage is visible.
